drill head blocked not stuck!

Talk about Chinese whispers!! Wow ! we have a very concise announcement saying the Drill Head is BLOCKED not STUCK. the announcement goes on to say "The Operator is pulling air hammer out of hole"
He could not be PULLING it out if it is stuck.. Why do so many posters refer to a stuck Drill Head!!

I have a more relevant question for YA PS181 and others with drilling experience -
"How long does it take to pull a drill string say 1400m long out of a hole and how long to replace it??"

"What would cause blocking of an air hammer drill head?? Could it be possible Gas Pressure is negating the Air pressure needed to drive the hammer??

And finally there has been more rain in area so will this inhibit remedy actions?

But please Posters forget STUCK drill head ! Just not true but could affect SP!!
Don